Revenant's Totem Is Too Fragile And Buggy
I know I will see my fair share of disagreements but hear me out: Revenants totem isn't great. A little less than half of the time the totem doesn't even spawn, you heard me right, because death protection has such a small timer and you only get about half your hp many times the most effective way to use a death totem is to hunker down and pop it as soon as they push you or right before. Because of the death totem's inherent buggy-ness, though, there doesn't even have to be any object in the way of it to cause it to de-spawn and it is a huge pain in the butt and many times a death sentence to try and replace it when they are pushing you. And the visual queue of missing your placed totem is too subtle.
Aside from this frustrating and hard-to-fix aspect of the totem it seems that even when it isn't bugged it takes an inconveniently competent team to use death totem properly, players have to completely change the way they play to group up to use your totem which is tough considering teams typically split up, flank, or push ahead of you when you want to place it, on top of that there is no on screen notification that revenant has just placed a totem all you get is the sound effect and the totem wallhack, an easy way to combat the issue of teammates not grabbing your totem would be to implement a mechanic where as long as you are in a certain range of the totem you can press a button to activate death protection, thus negating the need to have teammates physically next to you in order to grab your totem. This would also help with the fact that many randoms simply have no idea what the totem even does and if they do many just won't grab it.
Revenant is the only character in the game where you have to constantly call our your ult in order to make any use out of it, he is also the only character who's ultimate if misused can easily result in the death of your entire squad (and it is quite easy to misplace), enemies can use your totem, third parties can break your totem mid-push and negate any effectiveness that push could've had, or enemies can just camp the totem and wait for you to respawn at it. At some point the totem needs major change.